101 Piscium
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101 Piscium is a star in the zodiac constellation of Pisces,<ref name=Simbad/> located around 1,400 light years away from the Sun. This appears as a dim, blue-white hued star near the lower limit of visibility to the naked eye at an apparent visual magnitude of 6.23.<ref name=Anderson2012/> It is a suspected variable star with the designation NSV 559;<ref name=Samus2017/> 101 Piscium is the Flamsteed designation. The star is moving closer to the Earth with a heliocentric radial velocity of −10 km/s.<ref name=RV/>
This object has a stellar classification of B9.5 III,<ref name=Cowley1969/> matching a giant star that has consumed the hydrogen at its core and is evolving away from the main sequence.<ref name=zorec2012/> It is spinning rapidly with a projected rotational velocity of 246<ref name=zorec2012/> km/s, compared to a critical velocity of 270 km/s.<ref name=Huang2010/> The star has 4.5<ref name=zorec2012/> times the mass of the Sun and about 3.6<ref name=PasinettiFracassini2001/> times the Sun's radius. It is radiating around 1,000<ref name=zorec2012/> times the luminosity of the Sun from its photosphere at an effective temperature of 10,471 K.<ref name=zorec2012/>